hair dye egg colors (for reference):

blacks and greys:
Ash Hair Dye - 8f7d79
Black Hair Dye - 000000
Off Black Hair Dye - 0e0e0e

browns:
Worm Brown Hair Dye - 563822
Darkest Brown Hair Dye - 332215
Mahogany Hair Dye - 400d0a
Golden Brown Hair Dye - c67b30
Sand Brown Hair Dye - cc9966

reds:
Brick Red Hair Dye - 963729
Burgundy Hair Dye - 630017
Dark Retro Red Hair Dye - 741818
Darkest Red Hair Dye - 330000
Retro Red Hair Dye - d62529
Rust Hair Dye - 7a240a
Strawberry Blonde Hair Dye - cc6666

yellows and oranges:
Goldenrod Hair Dye - fdb647
Pale Yellow Hair Dye - fff4d9
Pastel Peach Hair Dye - ffcc99
Neon Orange Hair Dye - ff9900

purples:
Dark Plum Hair Dye - 330033
Deep Plum Hair Dye - 693953
Deep Purple Hair Dye - 660066
Neon Berry Hair Dye - cc00cc

greens and blues:
Deep Green Blue Hair Dye - 224727
Forest Green Hair Dye - 336600
Pastel Green Hair Dye - ccffcc

others:
Sand Hair Dye - e6ce8a Beach Glowing Egg